Yeah in my experience as well, high idle is most commonly a vac leak.  I've
seen a couple intake runners get good sized rust holes in them at the bases
as well, how much is rust a factor in where a hole might be?

Jim

________________________________________
Bostig Engineering
Engine Systems Voodoo
http://www.bostig.com/
617.272.3800

-----Original Message-----
From: Daniel L. Katz [mailto:katzd54@YAHOO.COM]
Sent: Sunday, November 26, 2006 6:14 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Need Help with Engine Speed Wildly Surging at Idle

since the idle speed screw has little effect, trouble may be significant
vacuum leak, perhaps at the throttle body/intake manifold interface.